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中国电机工程学报 2008, 28(6) 1-6 DOI:
ISSN: 0258-8013 CN: 11-2107/TM |
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| 高电压技术 |
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特高压线路覆冰脱落跳跃的动力计算研究 |
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侯镭 王黎明 朱普轩 关志成 |
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清华大学深圳研究生院 清华大学深圳研究生院 甘肃省电力设计院 清华大学深圳研究生院 |
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摘要：
导线脱冰是冰区输电线路中的常见现象，导线脱冰会引起导线的剧烈运动，使导线跳跃上下摆动，导线跳跃将导致导线档中空气间隙的减小，严重时以致相间闪络；同时脱冰跳跃还会对绝缘子串、金具及铁塔产生较大的动态拉力，对其产生破坏作用，在重冰区大档距的情况下，导线脱冰的影响尤为显著。特高压线路由于导线分裂根数较多，截面较大，其脱冰跳跃问题更为严重，特高压脱冰跳跃的考虑对于导线排列，铁塔选型，档距配置等都有重要意义。本文首先分析了导线脱冰时的非线性的非线性动力过程，建立了适用于导线脱冰跳跃分析的3自由度多档导线模型，确定了采用中心差分的显式积分方法作为计算方法。计算得到了导线脱冰跳跃的时程响应，并分析了脱冰量（百分比）、档距组合、导线机械参数、均匀与非均匀脱冰等因素的影响。 |
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关键词：
架空输电线路
脱冰跳跃
动力响应
数值计算
特高压
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Dynamic Behavior Computation of Ice Shedding of UHV Overhead Transmission Lines |
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HOU Lei WANG Li-ming ZHU Pu-xuan |
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Abstract:
Ice-shedding from conductors is a familiar phenomenon on overhead transmission line in iced area. Ice-shedding will cause the violent oscillation of the lines, and make the conductors jumping up and down. The jumping of the conductors reduces the phase-to-phase clearance, even leads to interphase flashover. The Ice-shedding also applies a large dynamic load on the insulator strings, fittings and towers, and brings destructive impact on them. In over iced areas and long-span cases, the effects of ice-shedding are especially significant. In UHV lines, because the quantity of bundled conductors and the section area of conductor are bigger, the ice-shedding problem is more serious. The consideration of the ice-shedding problems is very important in determining the alignment of the conductors, the type of towers and the configurations of spans. In this paper, the non-linear dynamic process of ice-shedding is analyzed first. Then a 3DOF dynamic model of multi-span line suitable for analyzing ice-shedding is presented. Explicit central difference integral is adopted as the computation method. The time responses of the ice-shedding are acquired. The influencing factors including percentage of ice-shedding, multi-span configuration, mechanical parameters of conductor, uniform and nonuniform mode ice-shedding are studied. |
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Keywords:
overhead transmission line
ice-shedding
dynamic response
numerical computation
UHV
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收稿日期 2007-03-20 修回日期 1900-01-01 网络版发布日期 |
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DOI: |
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基金项目:
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通讯作者: 侯镭 |
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作者简介: |
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作者Email: houl02@mails.tsinghua.edu.cn |
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| Copyright by 中国电机工程学报 |
